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Finding the Fourth Proportional to 118.65, 177.75 and 57.81

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Solution

The fourth proportional to 118.65, 177.75 and 57.81 is: 86.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.65 : 177.75 = 57.81 : x
  2. Step 2: Convert to fraction form
    118.65/177.75 = 57.81/x
  3. Step 3: Cross multiply
    118.65x = 177.75 × 57.81
  4. Step 4: Simplify right side
    118.65x = 10,275.73
  5. Step 5: Solve for x
    x = 10,275.73/118.65
  6. Step 6: Final answer
    x = 86.61

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.